Examines the various factors that make Earth suitable for life, including its size, weather system, distance from the sun, and other natural factors.

Famed British nature historian Sir David Attenborough narrates a five-part documentary focusing on wildlife and environmental issues confronting all people on the planet today. Stunning photography and vibrant footage of animals interacting in their natural habitats are the backgrounds for Attenborough's commentary. He offers dire warnings about how our beautiful planet is in peril from the encroachment of modern industrialization, global warming and other stresses threatening the natural world. Features awe-inspiring on-location photography of exotic animals amid breathtaking mountainscapes, oceans, rivers and remote forest lands. -- Probided by publisher.